When guest critic John Gardner isn’t booking Broadway shows, his English yellow Labrador retriever, Max, provides all the entertainment he needs. “The best place to take Max is happy hour in Rockford Park” in Wilmington’s Highlands area, he says. Nicknamed the Bark Park, Rockford offers designated off-leash areas where dogs are free to run, explore and do what dogs do. Humans tend to behave at Rockford, too, picking up after their dogs and respecting others. In other words, there’s a lot to do, but not a lot of doggie-do.